Re: Mercury 2004 125hp EFI 2 stroke acceleration
Welcome to iboats.
<br /><br />It runs on 2 cylinders at idle, and all 4 above 1/3 throttle or so. Acceleration is fine. Nail the throttle and all 4 will light up immediately. The idiosyncracy they have is that when the throttle is set for the motor to run at around 1/3 throttle (1800-2400rpms), it they can't decide whether to run on 2, 3, or 4 cylinders. Maintaining constant speed there is impossible. This mostly affects wakeboarders and beginning waterskiers. Pontoons, too. Otherwise that's about the RPM range where you'd be plowing thru the water at full sub-planing speed. Most people don't run there. They either idle around or pop the boat up on plane. But the exceptions I mentioned caused some dissatisfaction with the product. They troll well and they run out very nicely. It's only that one quirk. Otherwise they're fine.<br /><br />Oh yeah, they're not EFIs. At idle, the lower two carbs are jetted so that enough fuel gets thru to lubricate the piston, but not enough to burn. So that fuel goes out raw and unburned into the water. They're rather dirty motors, ecologically speaking.
